1 /* $OpenBSD: setjmp.S,v 1.2 2004/02/01 05:40:52 drahn Exp $ */
2 /* $NetBSD: setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $ */
4 /*
5 * Copyright (c) 1997 Mark Brinicombe
6 * Copyright (c) 2010 Android Open Source Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Mark Brinicombe
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
37 #include <private/bionic_asm.h>
38 #include <machine/setjmp.h>
39 #include <machine/cpu-features.h>
41 /*
42 * C library -- setjmp, longjmp
43 *
44 * longjmp(a,v)
45 * will generate a "return(v)" from the last call to
46 * setjmp(a)
47 * by restoring registers from the stack.
48 * The previous signal state is restored.
49 */
51 ENTRY(setjmp)
52 /* Block all signals and retrieve the old signal mask */
53 stmfd sp!, {r0, r14}
54 .cfi_def_cfa_offset 8
55 .cfi_rel_offset r0, 0
56 .cfi_rel_offset r14, 4
57 mov r0, #0x00000000
59 bl sigblock
60 mov r1, r0
62 ldmfd sp!, {r0, r14}
63 .cfi_def_cfa_offset 0
65 /* Store signal mask */
66 str r1, [r0, #(_JB_SIGMASK * 4)]
68 ldr r1, .Lsetjmp_magic
69 str r1, [r0, #(_JB_MAGIC * 4)]
71 /* Store core registers */
72 add r1, r0, #(_JB_CORE_BASE * 4)
73 stmia r1, {r4-r14}
75 #ifdef __ARM_HAVE_VFP
76 /* Store floating-point registers */
77 add r1, r0, #(_JB_FLOAT_BASE * 4)
78 vstmia r1, {d8-d15}
79 /* Store floating-point state */
80 fmrx r1, fpscr
81 str r1, [r0, #(_JB_FLOAT_STATE * 4)]
82 #endif /* __ARM_HAVE_VFP */
84 mov r0, #0x00000000
85 bx lr
86 END(setjmp)
88 .Lsetjmp_magic:
89 .word _JB_MAGIC_SETJMP
92 ENTRY(longjmp)
93 ldr r2, .Lsetjmp_magic
94 ldr r3, [r0, #(_JB_MAGIC * 4)]
95 teq r2, r3
96 bne botch
98 /* Fetch signal mask */
99 ldr r2, [r0, #(_JB_SIGMASK * 4)]
101 /* Set signal mask */
102 stmfd sp!, {r0, r1, r14}
103 .cfi_def_cfa_offset 12
104 .cfi_rel_offset r0, 0
105 .cfi_rel_offset r1, 4
106 .cfi_rel_offset r14, 8
107 sub sp, sp, #4 /* align the stack */
108 .cfi_adjust_cfa_offset 4
110 mov r0, r2
111 bl sigsetmask
113 add sp, sp, #4 /* unalign the stack */
114 .cfi_adjust_cfa_offset -4
115 ldmfd sp!, {r0, r1, r14}
116 .cfi_def_cfa_offset 0
118 #ifdef __ARM_HAVE_VFP
119 /* Restore floating-point registers */
120 add r2, r0, #(_JB_FLOAT_BASE * 4)
121 vldmia r2, {d8-d15}
122 /* Restore floating-point state */
123 ldr r2, [r0, #(_JB_FLOAT_STATE * 4)]
124 fmxr fpscr, r2
125 #endif /* __ARM_HAVE_VFP */
127 /* Restore core registers */
128 add r2, r0, #(_JB_CORE_BASE * 4)
129 ldmia r2, {r4-r14}
131 /* Validate sp and r14 */
132 teq sp, #0
133 teqne r14, #0
134 beq botch
136 /* Set return value */
138 mov r0, r1
139 teq r0, #0x00000000
140 moveq r0, #0x00000001
141 bx lr
142 #ifdef __ARM_26__
143 mov r15, r14
144 #else
145 mov r15, r14
146 #endif
148 /* validation failed, die die die. */
149 botch:
150 bl longjmperror
151 bl abort
152 b . - 8 /* Cannot get here */
153 END(longjmp)